"This is why our bikes have an unrivaled reputation for suppleness, plushness and bottom out control."

FOURby4 Suspension Technology

The Fourby4 suspension platform is the cornerstone of Knolly Bikes. When our CEO and chief designer, Noel Buckley, set out to design his first bike(the V-Tach), he started with a certain suspension philosophy and a list of ride characteristics that were important to him. He designed the suspension technology first… prioritizing traction, ride balance, and suspension performance while braking. He rode the first prototype and knew he had a winning suspension design, so he applied for patents and Knolly Bikes was born.

Inspired by Formula One auto racing strut-style suspension, Knolly’s patented Fourby4 suspension technology provides freedom in design and execution that no other design in the industry can tout. This freedom means that Noel can design each model from the ground up and manipulate wheel path and shock progression completely independently. This allows each model to have suspension rate curves that are generally linear to progressive, which is important because it means your shock doesn’t have to ‘save the day’ by providing lots of bottoming resistance, as it would on a bike with a falling rate curve. This helps keep your shock from being over-worked and over-heating on long downhills, which can affect shock performance. This also helps maintain normal shock service intervals. Each of our bikes have rate curves and leverage ratios that are implemented for a certain type of riding(trail, AM, DH) while all models share some fundamental ride characteristics:

"So Knolly’s unique and multi-patented Fourby4 Suspension is quite simply the most advanced and highest performing suspension design used in the mountain bike industry."

Modern high performance mountain bike suspension’s main goal is to control these four forces:

  • Pedaling Efficiency;

  • Traction (inversely proportional to Pedaling Efficiency);

  • Rear Brake Interaction pre-loading the Rear Shock (i.e. negatively affecting both traction and suppleness);

  • Rear Shock Progression (often called “Leverage Curve”).


No suspension design in the world can fully optimize these forces, but more sophisticated suspension designs can do a better job than lesser designs.  For example, decently engineered multi-link bikes can achieve a higher level of pedaling performance for a given amount of traction: they also have more ability to tune rear shock progression and can do a significantly better job isolating rear braking forces from the rest of the suspension.

However, even within the complicated world of multi-link bikes, there are differences and not all designs are created (or implemented) equally.  A really good multi-link bike can have subtle differences that allow the designers to fine tune control of suspension forces to an even higher level: they can also focus on one particular area (i.e. pedaling efficiency or shock progression) or perhaps on the bike’s overall performance, and have to compromise less in other area than inferior designs.

Why Knolly Fourby4 suspension is simply the best

However, each of these designs is still constrained in that they have to work with the four fundamental forces managed by a mountain bikes’ suspension system. Knolly Bikes’ Fourby4 Linkage system takes this to another level: our patented design allows us to separate the forces and to fully optimize them to suit each of our model's intended purpose. This is why our bikes have an unrivaled reputation for suppleness, plushness and bottom out control. Fourby4 separates Rear Shock Progression so we can tune it effectively without affecting the other three performance characteristics.  This also means that we can tune Pedaling Efficiency, Rear Wheel Traction and Rear Brake Neutrality without having to consider Rear Shock Control.  The engineering term is 'orthogonality' and it means that things (forces for example, or more accurately, vectors) act at a right-angle to one another and therefore don’t affect one another. #nerdwords

Why Knolly Fourby4 suspension is the best


This is priority number one. Without traction, there is no confidence… without confidence, there is no fun. The Fourby4 is a fully active design that is all about traction. There is no complicated pedaling platform designed mechanically into our frames, which means there’s nothing getting in the way of you finding every ounce of traction on the trail. Do you like technical climbing? There isn’t a better friend out on the ledgy climbs than our Fourby4 suspension. When you find yourself searching for every bit of grip out of your rear tire because you’ve committed to 30 foot section of the ‘steep and loose’, your Knolly will dig in and fight for as long as your legs can.  




Knolly Fourby4 suspenson
Knolly Fourby4 Suspension provides ultimate technical traction

Often you will hear riders talk about how well a bike climbs and ours are no exception - but we do differ. We never set out to design a bike that
excels at climbing fire-roads. That is not our style. Instead we engineered our bikes to be the best bike on the market for slaying technical climbs.

Knolly pedaling platform


This doesn’t have to be over-complicated, but so many times, it is. Many bikes on the market these days feature suspension designs that require a certain amount of chain torque in order to pedal smoothly. The problem with this philosophy is that you are never able to turn this ‘feature’ OFF in order to enjoy fully active travel and optimal traction. Knolly’s Fourby4 suspension pedals well in all iterations, without the need for complicated linkage tricks. Our active design provides a baseline for smooth pedaling characteristics, which can then be enhanced by any number of suspension shocks on today’s market. These shocks can provide a lockout or low-speed compression adjustment, which gives the rider total control over how the bike feels while climbing and descending.  



This is often an under-appreciated topic when it comes to suspension. Braking forces can impact how your bike tracks and finds traction. Fourby4 is a fully active design under braking forces, which is accomplished by proper pivot location. No brake induced suspension lockout, and no brake jack, just smooth and reliable suspension performance no matter how hard you’re gripping your brake levers. Fourby4 is proprietary to Knolly Bikes, which means we do not license the design out to any other manufacturer.

Knolly suspension remains active while braking
Knolly suspension is unparalled for control and composure

Rear Shock Control

When we talk about maximizing Rear Shock Control, we can tweak this characteristic between models in a very predictable way that allows our bigger bikes to have incredible suppleness, plushness and bottom out control while our lighter duty models focus more on shock support when climbing while still maintaining adequate mid-stroke and end of stroke composure.  We can easily accommodate the more progressive air springs of Trail inline shocks or more linear spring rates of coil and high volume air Enduro and DH shocks.


So at its heart, Fourby4 allows for the separation of competing suspension forces: it is the only suspension system in the world that can do this.  Simply put, conventional single pivot or multi-link (four bar, short link, etc…) bikes must make more compromises: they need to trade off performance in one area to get more performance in other areas.  Knolly does not!

Knolly suspension excells at technical climbing

Knolly Slack Position

We use adjustable geometry on many of our models (both past and present) and it is as simple as removing a bolt, sliding the shock forward or back and re-installing the bolt.

For those of you who have Knolly frames without the settings indicated here is the 411: The setting closest to the seat tube is SLACK. 

Knolly slack setting. What setting is the slack position on a Knolly frame? Knolly slack position. Knolly warden slack position.

Shock Sizes for our frames

Endorphin 26": Shock size: 7.875 x 2.25 / 3D LINKS Reducer & hardware spec: 21.8mm x M6 Top & Bottom. Straight LINKS Reducer & hardware spec: 41mm x M6 Top & 21.8 Bottom.


Endorphin: Shock size: 7.5 x 2.0 / Reducer & hardware spec: 21.8mm x M6 Top & Bottom. 2019 Reducer & hardware spec: 21.8mm x M8 Top & 21.8mm x M6 Bottom.


Warden: Shock size: 7.875 x 2.25 / Reducer & hardware spec: 21.8mm x M6 Top & Bottom

2019 Reducer & hardware spec: 21.8mm x M8 Top & 21.8mm x M6 Bottom


Warden Carbon: Shock size: 7.875 x 2.25 / Reducer & hardware spec: Top 21.8mm x M8 & Bottom 21.8mm x M6


Delirium: Shock size: 8.5" x 2.5" Freeride/Park Mode or 8.75" x 2.75" DH Mode Reducer & hardware spec: Top 21.8mm x M8 / Bottom 33.0mm x M8


Fugitive: Shock size: 185 x 50 / Reducer & hardware spec: Top - Trunnion mount, Bottom M8 X 25mm


Fugitive LT: Shock size: 185 x 55 / Reducer & hardware spec: Top - Trunnion mount, Bottom M8 X 25mm


Podium: Shock size: 9.5 x 3 / Reducer & hardware spec: Forward - 21.8 M8, rear -

43.8 M8 


Chilcotin: Shock size: 7.875 x 2.25 / Reducer/hardware spec: 3D Links Top 21.8mm x M6 / Bottom 21.8mm x M6. Straight links Top 41.0mm x M6